On the aluminum block system (ASTM E 127 and NBS TN924), efforts were focused on better definition of the measurement equipment (transducer and instrument), the implementation of a Measurement Assurance Program and Loaner Block Service, and modeling of the distance-amplitude relationship. It is shown that a large increase in the precision of reference block readings is easily achievable by implementing simple changes and controls in the measurement procedure. On steel and titanium blocks (e.g. ASTM E-428), efforts were directed toward quantifying the extent of reproducibility possible among blocks fabricated by both conventional drilling and by diffusion bonding. Reasonable reproducibility is achieved by both, with the diffusion-bonding process offering both advantages and disadvantages.
Final Report National Bureau of Standards
- Pub Date:
- April 1979
- Quality Control;
- Engineering (General)